US7421874B2 - Main cylinder or press cylinder of an extrusion/tube extrusion press - Google Patents

Main cylinder or press cylinder of an extrusion/tube extrusion press Download PDF

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Publication number
US7421874B2
US7421874B2 US10/524,644 US52464406A US7421874B2 US 7421874 B2 US7421874 B2 US 7421874B2 US 52464406 A US52464406 A US 52464406A US 7421874 B2 US7421874 B2 US 7421874B2
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United States
Prior art keywords
housing
cylinder
tube
bore
fixed
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Expired - Lifetime, expires
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US10/524,644
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English (en)
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US20060101886A1 (en
Inventor
Karl Hermann Claasen
Uwe Muschalik
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SMS Group GmbH
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SMS Eumuco GmbH
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Assigned to SMS EUMUCO GMBH reassignment SMS EUMUCO GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MUSCHALIK, UWE, CLAASEN, KARL HERMANN
Publication of US20060101886A1 publication Critical patent/US20060101886A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
    • B30B1/323—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure using low pressure long stroke opening and closing means, and high pressure short stroke cylinder means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/211—Press driving devices

Definitions

  • the invention relates to a main cylinder or press cylinder [compression cylinder] of a pipe or tube press and extrusion press which is mounted in a cylinder beam [traverse] and which has a press piston in its cylinder housing connected with a rod which projects from the cylinder housing.
  • a tube or extrusion press configured as a frameless metal extrusion press in which the rod of the press piston is configured as a piston rod, which are located at positions normally occupied by tension rods or columns of the usual press frame and which are connected with the counterbeam, is known from DE 198 35 717 (U.S. Pat. No. 6,082,162) with two such main press cylinders.
  • the main cylinders are thus configured with approximately the same stroke volume to both sides of the main press piston and a switchable connection is provided between the partial cylinder compartments on the two sides.
  • the press piston of the press cylinder supported by the cylinder beam is pressurized and for this purpose the piston rod of the press piston must extend to and be connected with the traveling beam.
  • the press piston with its piston rod is bored to form a passage over a part of the length to constitute a cylinder bore in which a plunger piston extends, the latter being braced against a cover closing the cylinder.
  • the pressurization of the plunger piston allows retraction of the press piston and with it via the piston rod, the traveling beam into the starting position. Further piston and cylinder units are braced against a base frame of this press in order to enable the traveling beam to be displaced over the play or nonload portion of its stroke in a rapid movement.
  • the invention thus has as its object to provide a main or press cylinder of the type described at the outset which, while retaining a short-circuiting flow technique for rapid movement, enables in a simpler manner a rapid transfer of the pressurizing oil from one to another compartment, thereby simultaneously reducing the structural cost and permitting a press construction which admits of a sufficiently large free space ahead of the counterbeam that extrusion products with radii or curvatures can be produced in an unhindered manner.
  • the rod is configured with an integrated forward drive and retraction cylinder and in an axial passage or bore thereof a telescoping or sword-like tube is received with formation of a pressurizable compartment connected via an annular gap with the pressurizable compartment in a flow path.
  • the annular space is surrounded concentrically by an elongated sleeve housing and the sword-like tube together with the sleeve housing at an end projecting from the rod is held stationary in a hydraulic connecting element which has a fluid connection or feeding opening into the telescoping tube and a connecting opening or fitting opening into the annular gap.
  • the rod is configured according to the invention differently than with the known configuration as a forward drive and retraction cylinder so that the otherwise conventional lateral cylinders are eliminated and simultaneously a more rapid forward drive and retraction of the press cylinder is achieved.
  • the pressurized oil head is so controlled or reversed with the known hydraulic means that it can give rise to a rapid advance by means of the telescoping tube and the compartment lying forwardly thereof in the axial bore of the rod or to a rapid retraction through the pressurizable compartment and then through the annular gap whereby the pressurization of the press piston in these directions are correspondingly supported by these additional oil quantities.
  • the invention provides that the bore be sealed against the sleeve housing by a packing which rides on the housing sleeve upon pressurization and which is fixed piston-like at the end of the rod and engages into the pressurizable compartment.
  • this rod seal delimiting the pressurizable compartment rearwardly slides upon the telescoping tube which together with the sleeve housing are held stationary, into its forward end position.
  • the end of the telescoping tube lying in the bore is configured with an enlarged head sealing the annular gap, this head fastening the telescoping tube with the sleeve housing in such manner that at this end a radial seal is formed by a collar against the inner surface of the bore.
  • the sealed radial collar of the sleeve is advantageously provided for the simultaneous flow connection of the annular gap with the pressurizable compartment between the housing sleeve and the inner surface of the axial bore of the rod in that, according to the invention, an annular gap is provided in the radial collar at the bores connected to the pressure compartment.
  • the cylinder chamber of the main cylinder housing is formed with a guide for the press piston and, the cylinder housing bottom is formed with a guide for the rod.
  • the configuration of the forward drive and retraction cylinder extends away from the counterbeam and rearwardly of the cylinder beam and the position of the rod is such that in the working compartment between the cylinder beam and the counterbeam of the press there are no unnecessary components which may be detrimental and can interfere with the working range and in addition lateral cylinders as well as a traverse for the ram itself can be completely omitted.
  • a further feature of the invention or solution to the objects set forth, in accordance with the invention is a tube and extrusion press in which the free forwardly projecting or counterlevered end of the rod is enclosed in an equalizing or compensating chamber affixed to the main cylinder housing and in which, upon pressurization of the press cylinder has a slider which is sealed with respect to the inner surface of the container and slides on the rod end removed from the main cylinder housing, whereby compartment formed between the rod and the compensating chamber is closed at its end by the slider and opens from the point of view of flow at the cylinder compartment lying behind the press piston at which a pressurized oil duct opens.
  • the compartment of the compensating chamber is connected to the tank conduit and preferably is arranged in a switchable blocking valve in the connecting line communicating with the cylinder housing bottom and which runs from that compartment to the cylinder compartment behind the press piston.
  • the open blocking valves four of which can be provided, configured as two-way valves built into the apparatus or also as logic controlled valves or cartridge valves, can be used to control the flow from the chamber of the compensating chamber of the supplied oil when the press piston, which has the same diameter as the compensating chamber, has reached its working position and is about to begin a press operation.
  • the connecting lines can be closed by means of the blocking valves so that the slider displaces the remaining oil quantity in the compensating chamber only back to the tank while the associated pressurization with oil under pressure will not suck back oil so that the tank can be spaced at a goodly distance from the press and be connected thereto by the oil pressure lines.
  • the oil lines need not, therefore, be of particularly large cross section as is the case where a compensating chamber is not provided at the end of the press stroke and upon reversal of the hydraulic control unit to initiate the retraction phase of the press piston back to its starting position in the cylinder housing, the flow flows back into the compensating cylinder, that is the oil in operation of the pipe or extrusion press is shifted back and forth under pressure.
  • the mode of operation with a compensating chamber is especially suitable in combination with the rod with its integrated forward drive and retraction cylinder of the above-described type because then no lateral cylinder is required for the forward and rearward movement.
  • FIGURE shows a construction in which the press piston rod is surrounded by an equalizing vessel and the rod has an integrated forward drive and retraction cylinder in accordance with an embodiment of the invention.
  • the extrusion press 1 has a cylinder beam 2 only one of which can be seen in the drawing and in which a cylinder housing 3 is mounted to form a main or press cylinder 4 .
  • the cylinder beam 2 lies in the plane of the view and to the left thereof is juxtaposed with an unillustrated tool (press plate, die holder and die) fitted onto a counterbeam.
  • the cylinder housing 3 holds a press piston 5 that at its front end in a press direction 6 is provided with a press ram 7 which, upon pressurization of the press piston 5 , presses a metal block which has been loaded into the receiver through the tool or die of the unillustrated counterbeam.
  • the press piston 5 is attached by screws to a rod 9 that extends rearwardly through a rear end 8 of the cylinder housing 3 .
  • the unit formed by the press piston 5 and the rod 9 are guided without play in a fully determined manner, namely, in a first guide 10 for the press piston 3 and second guide 11 for the piston rod 9 in the cylinder housing rear end 8 .
  • the rod 9 is integrated with a forward drive and retraction cylinder 12 .
  • a bore 13 extending along an axis A and provided in the rod 9 and a fixed hydraulic connection block 14 hold a telescoping or sword-shaped tube 15 and a housing sleeve 17 concentric and defining an annular gap 16 therewith.
  • the housing sleeve 17 defines a pressure chamber 18 with an inner surface of the bore 13 .
  • the ends of the housing sleeve 17 and the telescoping tube 15 extend into the axial bore 13 of the rod 9 and are guided with a thickened head 20 in a radial collar 19 sealed against the inner surface of the bore 13 , the thickened head 20 sealing the end of the annular gap 16 .
  • the pressure chamber 18 is sealed by a packing 21 that slides along the outer surface of the housing sleeve 17 during movement of the pressing piston 5 in its forward and rearward strokes and that is connected by screws to the rod 9 .
  • bores 22 are machined into the radial collar 19 of the housing sleeve 17 .
  • the hydraulic connecting block 14 has a pipe connection or fitting 23 opening into the telescoping tube 15 and a pipe connection or fitting 24 opening into the annular gap 16 and connected with an oil supply not shown and with a conventional hydraulic unit for the switchover of hydraulic fluid flow.
  • oil flows from the oil supply through a pressurized oil duct 27 into the cylinder chamber 28 behind the press piston 5 and simultaneously through the conduit 25 and the connection 23 into the telescoping tube 15 so that this additional oil quantity flows into a pressure chamber 29 axially in front of the radial collar 19 and the thickened head 20 in the bore 13 and supports the forward stroke.
  • the press piston 5 has reached its pressing position, the oil supply through the conduit 25 to the telescoping tube 15 is blocked and the working pressure is applied only via the pressurized oil line 27 to the chamber 28 ].
  • the embodiment shown in the drawing indicates further that the integrated forward drive and retraction cylinder and rod 9 are combined further with a compensating chamber 30 attached by screws to the cylinder housing bottom 8 .
  • the compensating chamber is closed at its rear end by a slide plate 31 fixed on the rod 9 and whose outer periphery is sealed against and slides along the inner surface of the vessel during the piston strokes.
  • the hydraulic connecting block 14 for the integrated forward drive and retraction cylinder 12 of the rod 9 is attached by screws to a bell 32 which, on its part, is attached by screws to the rear end of the compensating chamber 30 .
  • a compartment 33 enclosed between the compensating chamber 30 and the rod 9 and between the cylinder housing bottom 8 and the slider 13 contains oil which, from that compartment, flows either into the cylinder chamber 28 behind the press piston 5 through connecting passages 35 provided in the cylinder housing bottom 8 or through a tank conduit 34 into a tank or in the opposite direction for pressurization in the opposite sense and thus is moved back and forth.
  • switchable blocking valves 36 of cartridge construction and arranged in the connecting passages 35 are in their open operating positions so that oil can be displaced from the chamber 33 by the slider 31 under pressure into the cylinder or plunger chamber 28 .
  • the blocking valves 36 In the press position, the blocking valves 36 , of which a total of four are provided, are closed by the hydraulic control unit via control lines 37 and the pressurizable oil for the actual extrusion is supplied only via the pressurized oil conduit 27 to the cylinder chamber 28 through the tank line 34 which remains open during this operating phase.
  • the slider 31 displaces the residual oil remaining in the compartment 33 into the tank as the slider 31 is moved during the press stroke in the forward press direction 6 .
  • the end position assumed by the slider 31 at the conclusion of the press or working stroke has been shown in a dot dash line at 31 ′.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Actuator (AREA)
  • Press Drives And Press Lines (AREA)
  • Extrusion Of Metal (AREA)
  • Electric Cable Installation (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US10/524,644 2002-08-08 2003-08-05 Main cylinder or press cylinder of an extrusion/tube extrusion press Expired - Lifetime US7421874B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10236297.1 2002-08-08
DE10236297A DE10236297A1 (de) 2002-08-08 2002-08-08 Haupt- bzw. Preßzylinder einer Rohr- und Strangpresse
PCT/DE2003/002621 WO2004018120A1 (de) 2002-08-08 2003-08-05 Haupt- bzw. presszylinder einer rohr- und strangpresse

Publications (2)

Publication Number Publication Date
US20060101886A1 US20060101886A1 (en) 2006-05-18
US7421874B2 true US7421874B2 (en) 2008-09-09

Family

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Family Applications (1)

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US10/524,644 Expired - Lifetime US7421874B2 (en) 2002-08-08 2003-08-05 Main cylinder or press cylinder of an extrusion/tube extrusion press

Country Status (7)

Country Link
US (1) US7421874B2 (de)
EP (1) EP1526930B1 (de)
JP (1) JP4149995B2 (de)
AT (1) ATE366152T1 (de)
DE (2) DE10236297A1 (de)
ES (1) ES2289343T3 (de)
WO (1) WO2004018120A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150090132A1 (en) * 2012-05-10 2015-04-02 Sms Meer Gmbh Hydraulic extrusion press and method for operating a hydraulic extrusion press
US20150290690A1 (en) * 2011-10-31 2015-10-15 Sms Meer Gmbh Extruder and tube extruder or metal extrusion press
US9649680B2 (en) 2011-10-31 2017-05-16 Sms Meer Gmbh Method for producing metal extrusion press products, and extrusion and tube press

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101985150B (zh) * 2010-08-02 2013-06-12 天津市天锻压力机有限公司 具有等温锻造和压制电极复合功能的液压机
CN102729518B (zh) * 2011-04-13 2015-12-16 昆山永年先进制造技术有限公司 液压机、用于液压机的缸梁结构及其制造方法
DE102014209685B3 (de) * 2014-05-21 2015-10-22 Sms Meer Gmbh Strangpresse mit Hydraulikantrieb
LU92917B1 (de) * 2015-12-17 2017-06-19 Sms Group Gmbh Strang- und Rohrpresse bzw. Metallstrangpresse

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201966A (en) * 1961-05-23 1965-08-24 Benteler Werke Ag Apparatus for the extrusion pressing of tubes, especially steel tubes
US3243984A (en) * 1963-09-20 1966-04-05 Baldwin Lima Hamilton Corp Extrusion press for hollow extrusions
US3355927A (en) * 1964-03-05 1967-12-05 Baldwin Lima Hamilton Corp Extrusion press for multiple tube configurations and the like
FR2154971A5 (en) * 1971-10-01 1973-05-18 Morane Somua Presses Mat Direct method drawing presses - with simplified charging and shortened drive element work path
US4084422A (en) * 1974-04-24 1978-04-18 Schloemann-Siemag Aktiengesellschaft Extrusion press
EP0706843A1 (de) 1994-08-17 1996-04-17 VAW Aluminium AG Verfahren und Vorrichtung zur Herstellung von gekrümmten Werkstücken
US6082162A (en) * 1998-08-07 2000-07-04 Sms Eumuco Gmbh Multiple-cylinder extrusion press

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5215627B1 (de) * 1971-07-10 1977-05-02
JPS56165556A (en) * 1980-05-23 1981-12-19 Mitsubishi Heavy Ind Ltd Die clamping device
JPH0773784B2 (ja) * 1990-08-15 1995-08-09 日精樹脂工業株式会社 成形機の型締装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201966A (en) * 1961-05-23 1965-08-24 Benteler Werke Ag Apparatus for the extrusion pressing of tubes, especially steel tubes
US3243984A (en) * 1963-09-20 1966-04-05 Baldwin Lima Hamilton Corp Extrusion press for hollow extrusions
US3355927A (en) * 1964-03-05 1967-12-05 Baldwin Lima Hamilton Corp Extrusion press for multiple tube configurations and the like
FR2154971A5 (en) * 1971-10-01 1973-05-18 Morane Somua Presses Mat Direct method drawing presses - with simplified charging and shortened drive element work path
US4084422A (en) * 1974-04-24 1978-04-18 Schloemann-Siemag Aktiengesellschaft Extrusion press
EP0706843A1 (de) 1994-08-17 1996-04-17 VAW Aluminium AG Verfahren und Vorrichtung zur Herstellung von gekrümmten Werkstücken
US6082162A (en) * 1998-08-07 2000-07-04 Sms Eumuco Gmbh Multiple-cylinder extrusion press

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150290690A1 (en) * 2011-10-31 2015-10-15 Sms Meer Gmbh Extruder and tube extruder or metal extrusion press
US9649680B2 (en) 2011-10-31 2017-05-16 Sms Meer Gmbh Method for producing metal extrusion press products, and extrusion and tube press
US10166585B2 (en) * 2011-10-31 2019-01-01 Sms Meer Gmbh Extruder and tube extruder or metal extrusion press
US20150090132A1 (en) * 2012-05-10 2015-04-02 Sms Meer Gmbh Hydraulic extrusion press and method for operating a hydraulic extrusion press
US11407192B2 (en) * 2012-05-10 2022-08-09 Sms Group Gmbh Hydraulic extrusion press and method for operating a hydraulic extrusion press

Also Published As

Publication number Publication date
JP4149995B2 (ja) 2008-09-17
US20060101886A1 (en) 2006-05-18
DE10236297A1 (de) 2004-02-19
EP1526930A1 (de) 2005-05-04
WO2004018120A1 (de) 2004-03-04
ATE366152T1 (de) 2007-07-15
DE50307620D1 (de) 2007-08-16
ES2289343T3 (es) 2008-02-01
EP1526930B1 (de) 2007-07-04
JP2005534501A (ja) 2005-11-17

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